Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1990-02-23
1991-04-30
Taylor, Dennis L.
Fluid handling
Line condition change responsive valves
Direct response valves
1375278, 251250, 405169, F16K 1500
Patent
active
050109197
ABSTRACT:
A subsea barrier valve 20 with a valve clapper 60 adapted for free swinging movement on a clapper shaft 62 between a position which closes the flow passage through the valve and a position proximate the fully open position such that the clapper is held open by a pressurized flow of gas through the valve. In the event of an upstream pipeline failure, the clapper closes in a "fail-safe" manner. The clapper can be pivoted and locked in the full open position by axial rotation of a locking shaft 105 which extends through a cover member 30 for an access opening in the valve body 21. The locking shaft 105 extends perpendicular to the clapper shaft 62 and is interconnected therewith by a gear drive 106 including a clutch gear 126 which allows a limited range of free pivotal movement of the clapper 60. The locking shaft 105 is controlled by actuator means 140,141 mounted on the cover member 30 by a separable fastener 142. The cover member 30 is clamped by a releasable clamp means 35. Projecting mandrels 260 on a clamping ring component 85 of the releasable clamp means 35 can be seized by a grappling tool for release or installation of the clamp means. A similar mandrel 149 on the cover member 30 allows for retrieval of the valve 20 or its intervals when the cover member 30 is released. Mandrels 208 provided on a support plate 144 for the actuator means 140,141 permit the retrieval or replacement of the actuator means.
REFERENCES:
patent: 2974921 (1961-03-01), Kaswan
patent: 3478778 (1969-11-01), Curtiss et al.
patent: 3720229 (1973-03-01), Masson et al.
patent: 3766978 (1973-10-01), Orund et al.
patent: 4188973 (1980-02-01), Weise et al.
patent: 4217929 (1980-08-01), Pelt
patent: 4387735 (1983-06-01), Ripert
patent: 4502503 (1985-03-01), Karpenko
patent: 4565210 (1986-01-01), Heine et al.
Taylor Dennis L.
Tom Wheatley Valve Co.
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